In an interview earlier this month, which marks the 50th anniversary of the JFK assassination, Kerry said he has "serious doubts" that Lee Harvey Oswald acted alone. Check out the video below:

While Kerry didn't name any specific doubts, an excellent overview of inconsistencies in the JFK assassination can be found in this scene from Oliver Stone's JFK, a 1991 movie that documents New Orleans District Attorney Jim Garrison's little-known attempt to prosecute businessman Clay Shaw for taking part in a conspiracy to murder Kennedy: